fix: checksum

pkg/healthcheck/verify.go

@@ -1,75 +1,90 @@
 package healthcheck
 
 import (
-	"bufio"
+	"crypto/sha256"
+	"encoding/hex"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
+	"strings"
 )
 
-// fileExists checks if a file exists at the specified path.
-func fileExists(filePath string) bool {
-	_, err := os.Stat(filePath)
-	return !os.IsNotExist(err)
-}
-
-// filesMatch checks if two files are identical.
-func filesMatch(file1, file2 string) (bool, error) {
-	f1, err := os.Open(file1)
+// getChecksum calculates the SHA-256 checksum of a file
+func getChecksum(filePath string) (string, error) {
+	// Open the file
+	file, err := os.Open(filePath)
 	if err != nil {
-		return false, err
+		return "", err
 	}
-	defer f1.Close()
+	defer file.Close()
 
-	f2, err := os.Open(file2)
+	// Calculate SHA-256
+	hash := sha256.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", err
+	}
+
+	return hex.EncodeToString(hash.Sum(nil)), nil
+}
+
+// checkFileChecksum checks if a single file's checksum matches the expected value
+func checkFileChecksum(rootDir, fileName, expectedChecksum string) (bool, string) {
+	filePath := filepath.Join(rootDir, strings.TrimSpace(fileName))
+	actualChecksum, err := getChecksum(filePath)
 	if err != nil {
-		return false, err
+		return false, fmt.Sprintf("Error reading file %s: %v", filePath, err)
 	}
-	defer f2.Close()
 
-	scanner1 := bufio.NewScanner(f1)
-	scanner2 := bufio.NewScanner(f2)
-
-	for scanner1.Scan() && scanner2.Scan() {
-		line1 := scanner1.Text()
-		line2 := scanner2.Text()
-
-		if line1 != line2 {
-			return false, nil
+	if actualChecksum == expectedChecksum {
+		return true, fmt.Sprintf("Checksum for %s passed!", filePath)
+	} else {
+		return false, fmt.Sprintf("Checksum for %s failed. Expected %s, but got %s. Please revert the changes!", filePath, expectedChecksum, actualChecksum)
 	}
 }
 
-	if scanner1.Scan() || scanner2.Scan() {
-		// One file has more lines than the other
-		return false, nil
+func VerifyFiles(rootDir string,checkFileNameList string, checkFileSumList string ) error {
+	// Parse command-line arguments
+	// checkFileNameList := flag.String("checkFileNameList", "", "Comma-separated list of files to check.")
+	// checkFileSumList := flag.String("checkFileSumList", "", "Comma-separated list of expected checksums.")
+	// rootDir := flag.String("rootDir", ".", "Root directory containing the files.")
+	// flag.Parse()
+
+	// Process input file names and checksums
+	fileNames := strings.Split(checkFileNameList, ",")
+	checkSums := strings.Split(checkFileSumList, ",")
+
+	// Check if the number of files matches the number of checksums
+	if len(fileNames) == 0 {
+		return fmt.Errorf("No checksum happened")
 	}
 
-	return true, nil
+	if len(fileNames) != len(checkSums) {
+		return fmt.Errorf("Error: The number of files and checksums do not match.")
+		os.Exit(1)
 	}
 
-// VerifyDirectory checks if the contents of two directories are identical.
-func VerifyDirectory(rootDir, compareDir string) error {
-	err := filepath.Walk(rootDir, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return fmt.Errorf("error walking directory: %w", err)
+	allPassed := true
+	var errorMessages []string
+
+	// Check each file's checksum
+	for i, fileName := range fileNames {
+		expectedChecksum := strings.TrimSpace(checkSums[i])
+		passed, message := checkFileChecksum(rootDir, fileName, expectedChecksum)
+		return fmt.Errorf(message)
+		if !passed {
+			allPassed = false
+			errorMessages = append(errorMessages, message)
 		}
-		if !info.IsDir() {
-			relPath, _ := filepath.Rel(rootDir, path)
-			file2 := filepath.Join(compareDir, relPath)
-			if !fileExists(file2) {
-				return fmt.Errorf("File %s is missing. Please immediately revert your changes!\n",
-					filepath.Join(rootDir, relPath))
 	}
-			match, err := filesMatch(path, file2)
-			if err != nil {
-				return fmt.Errorf("error matching files: %w", err)
-			}
-			if !match {
-				return fmt.Errorf("File %s is altered. Please revert your changes or contact the teaching team if you have a valid reason for adjusting them.\n",
-					filepath.Join(rootDir, relPath))
+
+	if allPassed {
+		return fmt.Errorf("Congratulations! All checksums passed!")
+	} else {
+		return fmt.Errorf("Some checksums failed. Please review the errors below:")
+		for _, msg := range errorMessages {
+			return fmt.Errorf(msg)
 		}
 	}
 	return nil
-	})
-	return err
 }